Java Spring mvc 控制器 bean 配置

Spring mvc controller bean configuration

提问by lightbringer

I am working on a project using Spring mvc and I counter a problem that a handler is auto generated when I start the server.

我正在使用 Spring mvc 处理一个项目，我解决了启动服务器时自动生成处理程序的问题。

Here is the code:

这是代码：

Controller

控制器

@Controller
@RequestMapping(value="userstory/{projectid}/{sprintid}/")
@SessionAttributes(value = "user")
public class UserstoryController {
    private ISprintService sprintService;
    private IUserStoryService userStoryService;
    private IProjectService projectService;
    private IBurnDownChartService burnDownChartService;
    private ITaskService taskService;

    public void setSprintService(ISprintService sprintService) {
        this.sprintService = sprintService;
    }

    public void setUserStoryService(IUserStoryService userStoryService) {
        this.userStoryService = userStoryService;
    }

    public void setProjectService(IProjectService projectService) {
        this.projectService = projectService;
    }

    public void setBurnDownChartService(IBurnDownChartService burnDownChartService) {
        this.burnDownChartService = burnDownChartService;
    }

    public void setTaskService(ITaskService taskService) {
        this.taskService = taskService;
    }

    @RequestMapping(method=RequestMethod.GET)
    public String getUserstoryPage(@PathVariable("projectid") int pid, @PathVariable("sprintid") int sid,  @ModelAttribute("user") SerializablePerson user) {
        if (user.getId() != 0) {
            Project p = this.projectService.findProjectById(pid);
            if (p == null) {
                throw new ResourceNotFoundException(pid);
            }
            if (user.getRole().equals("User")) {
                return "userstory/user_userstory";
            }
            else {
                return "userstory/admin_userstory";
            }
        }
        return "redirect:../../../login";
    }

}

beans.xml

bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
    <bean id="personServiceImpl" class="ch.bsgroup.scrumit.service.impl.PersonServiceImpl" />
    <bean id="projectServiceImpl" class="ch.bsgroup.scrumit.service.impl.ProjectServiceImpl" />
    <bean id="sprintServiceImpl" class="ch.bsgroup.scrumit.service.impl.SprintServiceImpl" />
    <bean id="userStoryServiceImpl" class="ch.bsgroup.scrumit.service.impl.UserStoryServiceImpl" />
    <bean id="taskServiceImpl" class="ch.bsgroup.scrumit.service.impl.TaskServiceImpl" />

    <bean id="projectService" class="ch.bsgroup.scrumit.service.impl.ProjectServiceImpl" />
    <bean id="personService" class="ch.bsgroup.scrumit.service.impl.PersonServiceImpl" />

    <bean id="sprintService" class="ch.bsgroup.scrumit.service.impl.SprintServiceImpl" />
    <bean id="userStoryService" class="ch.bsgroup.scrumit.service.impl.UserStoryServiceImpl" />
    <bean id="burnDownChartService" class="ch.bsgroup.scrumit.service.impl.BurnDownChartServiceImpl" />
    <bean id="taskService" class="ch.bsgroup.scrumit.service.impl.TaskServiceImpl" />

    <bean id="sprintUserstoryController" class="ch.bsgroup.scrumit.controller.SprintUserstoryController">
        <property name="sprintService">
            <ref local="sprintService"/>
        </property>
        <property name="userStoryService">
            <ref local="userStoryService"/>
        </property>
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="burnDownChartService">
            <ref local="burnDownChartService"/>
        </property>
        <property name="taskService">
            <ref local="taskService"/>
        </property>
    </bean>

    <bean id="boardController" class="ch.bsgroup.scrumit.controller.BoardController">
        <property name="sprintService">
            <ref local="sprintService"/>
        </property>
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="userStoryService">
            <ref local="userStoryService"/>
        </property>
        <property name="taskService">
            <ref local="taskService"/>
        </property>
        <property name="burnDownChartService">
            <ref local="burnDownChartService"/>
        </property>
    </bean>

    <bean name="register.jsp" id="registerController" class="ch.bsgroup.scrumit.controller.RegisterController">
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="loginController" class="ch.bsgroup.scrumit.controller.LoginController" >
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="adminProjectController" class="ch.bsgroup.scrumit.controller.AdminProjectController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="userProjectController" class="ch.bsgroup.scrumit.controller.UserProjectController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
    </bean>

    <bean id="adminPersonController" class="ch.bsgroup.scrumit.controller.AdminPersonController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="manageProjectMemberController" class="ch.bsgroup.scrumit.controller.ManageProjectMemberController">
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="personService">
            <ref local="personService"/>
        </property>
    </bean>

    <bean id="manageUserstoryController" class="ch.bsgroup.scrumit.controller.UserstoryController">
        <property name="sprintService">
            <ref local="sprintService"/>
        </property>
        <property name="userStoryService">
            <ref local="userStoryService"/>
        </property>
        <property name="projectService">
            <ref local="projectService"/>
        </property>
        <property name="burnDownChartService">
            <ref local="burnDownChartService"/>
        </property>
        <property name="taskService">
            <ref local="taskService"/>
        </property>
    </bean>
</beans>

I copy all the beans to show that there is no userstoryController mapped.

我复制所有 bean 以显示没有映射 userstoryController。

web.xml

网页.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <filter>
    <filter-name>UrlRewriteFilter</filter-name>
    <filter-class>org.tuckey.web.filters.urlrewrite.UrlRewriteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>UrlRewriteFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>scrumit</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>/WEB-INF/spring/app-config.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>scrumit</servlet-name>
    <url-pattern>/app/*</url-pattern>
  </servlet-mapping>
</web-app>

app-config.xml

应用程序配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

    <!-- Scans the classpath of this application for @Components to deploy as beans -->
    <context:component-scan base-package="ch.bsgroup.scrumit.controller" />

    <!-- Application Message Bundle -->
    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="/WEB-INF/messages/messages" />
        <property name="cacheSeconds" value="0" />
    </bean>

    <!-- Including beans -->
    <import resource="beans.xml" />

    <!-- Configures Spring MVC -->
    <import resource="mvc-config.xml" />

</beans>

And this is what I have when I start the server:

这就是我启动服务器时所拥有的：

INFO : org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping - Mapped URL path [/userstory/{projectid}/{sprintid}/] onto handler 'userstoryController'

The error is:

错误是：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping#0': Initialization of bean failed; nested exception is java.lang.IllegalStateException: Cannot map handler 'manageUserstoryController' to URL path [/userstory/{projectid}/{sprintid}/]: There is already handler of type [class ch.bsgroup.scrumit.controller.UserstoryController] mapped.

The program does not allow me to map UserstoryController to manageUserstoryController because of the existence of userstoryController.

由于userstoryController 的存在，程序不允许我将UserstoryController 映射到manageUserstoryController。

Could anyone explain to me why userstoryController is generated, and how to map it properly. Thanks in advance.

谁能向我解释为什么生成 userstoryController 以及如何正确映射它。提前致谢。

采纳答案by Sotirios Delimanolis

The issue is the following. This element

问题如下。这个元素

<context:component-scan base-package="ch.bsgroup.scrumit.controller" />

already creates an instance of your UserstoryControllercontroller because of @Controller. And then the <bean>elements in beans.xmlcreates another one.

已经为您创建的实例UserstoryController，因为控制器@Controller。然后<bean>元素在beans.xml创建另一个。

When you annotate a class with @Controllerand have an appropriate component-scan, you should not declare a separate beanelement in your context.

当您使用 注释一个类@Controller并具有适当的 时component-scan，您不应bean在您的上下文中声明一个单独的元素。

The fact is, all of this

事实是，这一切

<bean id="boardController" class="ch.bsgroup.scrumit.controller.BoardController">
    <property name="sprintService">
        <ref local="sprintService"/>
    </property>
    <property name="projectService">
        <ref local="projectService"/>
    </property>
    <property name="userStoryService">
        <ref local="userStoryService"/>
    </property>
    <property name="taskService">
        <ref local="taskService"/>
    </property>
    <property name="burnDownChartService">
        <ref local="burnDownChartService"/>
    </property>
</bean>

can be replaced with appropriate @Autowiredannotations on fields. You don't even need getters and setters. For example

可以用@Autowired字段上的适当注释替换。你甚至不需要 getter 和 setter。例如

@Controller
@RequestMapping(value="userstory/{projectid}/{sprintid}/")
@SessionAttributes(value = "user")
public class UserstoryController {
    @Autowired
    private ISprintService sprintService;

    @Autowired
    private IUserStoryService userStoryService;

    @Autowired
    private IProjectService projectService;

    @Autowired
    private IBurnDownChartService burnDownChartService;

    @Autowired
    private ITaskService taskService;

    @RequestMapping(method=RequestMethod.GET)
    public String getUserstoryPage(@PathVariable("projectid") int pid, @PathVariable("sprintid") int sid,  @ModelAttribute("user") SerializablePerson user) {
        if (user.getId() != 0) {
            Project p = this.projectService.findProjectById(pid);
            if (p == null) {
                throw new ResourceNotFoundException(pid);
            }
            if (user.getRole().equals("User")) {
                return "userstory/user_userstory";
            }
            else {
                return "userstory/admin_userstory";
            }
        }
        return "redirect:../../../login";
    }
}

Here's some related documentation:

这是一些相关的文档：

• What's the difference between @Component, @Repository & @Service annotations in Spring?
• Spring MVC: difference between <context:component-scan>and <annotation-driven />tags?
• Difference between <context:annotation-config>vs <context:component-scan>

• Spring 中的 @Component、@Repository 和 @Service 注解有什么区别？
• Spring MVC：<context:component-scan>和<annotation-driven />标签之间的区别？
• <context:annotation-config>VS之间的区别<context:component-scan>